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High Voltage 2024年第2期9卷 410-418页

作者： Haitian Wang Yi Luo Mingyu Zhou xintong ren George Chen GEIRI BerlinGermany The Tony Davies High Voltage Laboratory University of SouthamptonSouthamptonUK

The potential of using eco-friendly thermoplastic polypropylene(PP)-based insulation for high voltage direct current(HVDC)cable has been widely investigated but much less work on the PP-based semiconducting screen(SC).Considering a long service life(>30 years)under high temperature and high electrical stress is required for typical HVDC cables,and investigations on the effect of antioxidant(AO)concentration and thermal oxidative sta-bility,mechanical,and electrical properties of PP-based SCs have been *** has been demonstrated that an appropriate combination and amounts of AOs are critical for achieving high thermal stability and maintaining the mechanical properties of SC after ageing in a harsh environment(150°C,with Cu,in air,7 days).Although higher amounts of space charges have been observed in SC/PP/SC samples with higher AO concentrations,the impact on space charge behaviours is less after ageing,suggesting that ageing(or operating at high temperature)leads to microstructure evolution in SC and can potentially mitigate space accumulation in PP-based insulating materials.

关键词： microstructure thermal high

Investigation on effect of semiconducting screen on space charge behaviour of polypropylene-based polymers for HVDC cables

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High Voltage 2022年第5期7卷 968-981页

作者： Mingyu Zhou Haitian Wang xintong ren George Chen Yi Luo Fan Yu Global Energy Interconnection Research Institute Europe GmbH BerlinGermany The Tony Davies High Voltage Laboratory University of SouthamptonSouthamptonHampshireUK Global Energy Interconnection Research Institute Co. Ltd.BeijingChina

High voltage direct current(HVDC)power transmission cable is critical for realising sustainability through renewable energy ***-friendly thermoplastic polypropylene(PP)-based polymers/nanocomposites are regarded as promising candidates for replacing current thermoset crosslinked polyethylene(XLPE)*** an essential component of the extruded HVDC cable for improving conductor/insulation interface and suppressing charge injection to insulation at high DC electrical stresses,developing semiconducting(SC)screens that are compatible with PP-based insulation is of similar importance but has not been well studied *** work aims at designing PP-based semiconducting screens and investigating space charge behaviours of SC/PP/SC sandwich specimen to unfold the effect of semiconducting materials,bonding methods,applied DC electric field,and temperature on charge injection,accumulation,transportation,and dissipation in PP-based *** conventional thermal,mechanical,and low field electrical characterisations demonstrated that all of the developed semiconducting materials meet the performance criteria of commercial semiconducting materials,their space charge and local electric field distribution varied significantly at high DC *** with the traditional non-bonded configuration used at lab-scale,charge injection was enhanced in hot-pressed SC/PP/SC samples with tightly bonded interfaces,which better reflects the real situation in extruded *** temperature further intensified charge ***,our results also revealed that high temperature and electric field strongly influence charge mobilities and consequently their distribution and local electric field in PP-based insulations.

关键词： charge insulation effect

Low-cost Free-standing ferroelectric polymer films with high polarization produced via pressing-and-folding

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Journal of Materiomics 2022年第3期8卷 640-648页

作者： Nan Meng xintong ren Jiyue Wu Emiliano Bilotti Michael J.Reece Haixue Yan State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai201620China School of Engineering and Materials Science Queen Mary University of LondonMile End RoadLondonE14NSUK Department of Materials Science and State Key Laboratory of Molecular Engineering of Polymers Fudan UniversityShanghai200433China

Ferroelectric polymer poly(vinylidene fluoride)(PVDF)shows excellent electro-activity and is promising for flexible electronic ***,the processing of PVDF into the favourable ferroelectric structure(β-phase)presents difficulties,while its copolymer with trifluoroethylene(PVDF-TrFE)can directly crystallize into β-phase,but shows limited thermal stability and high-cost *** a result,an easily implementable method,pressing-and-folding(P&F),was used to produce highly compatible blended films of PVDF and PVDF-TrFE without using any hazardous solvent or complex polymer processing ***-pressed PVDF(molecular weight:530 kg/mol)and PVDF-TrFE(molar ratio:51/49)films were firstly stacked before undergoing P&F *** to extrusion-blended films before and after P&F,the P&F stacked films showed isotropic crystalline structure of b-phase,as confirmed using X-ray diffraction and infrared *** ferroelectric remnant polarization of the P&F stacked films is 0.068 C/m^(2),surpassing pure PVDF-TrFE(0.062 C/m^(2))and the simulated value of remnant polarization of pure PVDF(~0.065 C/m^(2)).The above findings promise to provide inspirations for new processing strategy on PVDF-based functional polymers.

关键词： Polymer blends PVDF PVDF-TrFE Ferroelectric Polarization

Competitive intermetallics formation in Pd-Zn-Cd system via seeded growth from ultra-thin Pd nanosheets for electrocatalytic ethanol oxidation reaction

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Nano Research 2024年第9期17卷 8552-8559页

作者： Donghao Zhang Lianxi Si Qianqian ren xintong Yan Shi Hu Department of Chemistry School of ScienceTianjin Key Laboratory of Molecular Optoelectronic ScienceTianjin UniversityTianjin 300072China

Pd-based catalysts exhibit higher catalytic activity and durability in many electrochemical ***,the electrochemical performance can be further enhanced by fine-tune of the alloy *** binary alloys have been fully studied,the multicomponent alloys are far beyond understanding,which leaves cocktail effect a compromised explanation for the high-entropy *** Pd nanosheet-seeded growth was used to synthesize a Pd-Zn-Cd ternary alloy by accurately controlling the Pd-Zn-Cd molar ratio through adjusting the amount of introduced Cd *** analysis of the crystal phase structure of PdCdZnx and PdZn_(x)Cd_(1-x),the competitive relationship of Zn and Cd in the alloying process with Pd was unveiled:Pd1Cd1 intermetallics(IMC)is thermodynamically favored over Pd_(1)Zn_(1)IMC in the ternary ***,the increased structure stability of PdCd over PdZn does not bring about increased durability in the catalytic ethanol oxidation *** morphology selection of Pd seeds is also crucial for the study,as Pd cubes,Pd tetrahedrons,and Pd octahedrons do not form PdZn in the same *** successful alloying through the seeded growth depends on the maximum diffusion depth of foreign atoms into the seed.

关键词： PdZn alloy seed growth method ethanol oxidation reaction composition control ternary alloying

Frequency-Self-Adaptive Radio Frequency Power Harvester Enabled by Shape-Reconfigurable Liquid Metal

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Electromagnetic Science 2024年第2期2卷 91-103页

作者： Cheng Zhang Yuchao Wang Zebin Zhu Hai Lin Kun Wang xintong Shi Yi Du Chaoyun Song Long ren Qiang Cheng Key Laboratory of Materials for High-Power Laser Shanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghai 201800China Hangzhou Institute for Advanced Study University of Chinese Academy of SciencesHangzhou 310024China College of Physical Science and Technology Central China Normal UniversityWuhan 430000China Center of Quantum and Matter Science and School of Physics Beihang UniversityBeijing 100191China Department of Engineering King’s College LondonLondon WC2R 2LSUK State Key Laboratory of Radio Frequency Heterogeneous Integration College of Electronics and Information EngineeringShenzhen UniversityShenzhen 518000China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing International School of Materials Science and EngineeringWuhan University of TechnologyWuhan 430000China State Key Laboratory of Millimeter Waves Southeast UniversityNanjing 210096China

Radio frequency(RF)energy harvester as an efficient tool for capturing and converting the flourishing ambient RF energy provides a promising solution for long-term powering the wireless sensor networks and the Internet of things(IoTs).However,the actual distribution of the environmental RF signals is dynamically frequency-dependent due to the diverse wireless terminals only interacting with specified *** take full advantage of the RF energy carrying this characteristic,an intelligent RF energy harvester is in demand to automatically sense the frequency information of an incident signal and conduct the corresponding RF-to-direct current transformation ***,to the best of my knowledge,a frequency-self-adaptive RF harvester is first presented with the help of the shape-reconfigurable liquid metal,which can precisely identify and efficiently convert an arbitrary signal from the frequency span of 1.8 to 2.6 *** with a microcontroller unit and a tensile system,the dynamic functionality of the entire system is comprehensively demonstrated,showing promising potential to significantly advance various fields,including sustainable IoT applications,green wearable technologies,and self-powered devices.

关键词： Liquid metal Radio frequency power harvesting Frequency-self-adaptive Broadband rectification

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宁波甬江北工业遗产保护利用研究

遗产与保护研究 2019年第3期4卷 48-50页

作者：任昕彤荣玥芳北京建筑大学北京100044

文章基于对宁波甬江北工业遗产的实地调研,对该区域的工业遗产现状进行总结及价值提炼。通过分析甬江北地区的发展瓶颈,提出甬江北地区发展的建议,旨在为工业遗产的保护及利用提供思路。

关键词：工业遗产开发保护利用

基于分数阶三参数模型的HTPB推进剂粘弹性力学响应分析

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固体火箭技术 2024年第2期47卷 173-180页

作者：梁渊哲任全彬何高让郜婕王新彤西安航天动力技术研究所西安710025 航天动力技术研究院西安710025

为拓展分数阶粘弹性模型在端羟基聚丁二烯(HTPB)推进剂中的应用,研究分数阶粘弹性模型预示推进剂频域下的动态模量变化。推导了三维下的分数阶三参数模型,并结合Grünwald-Letnikov定义编写UMAT子程序。为标定本构参数,推导了带有预加... 详细信息

为拓展分数阶粘弹性模型在端羟基聚丁二烯(HTPB)推进剂中的应用,研究分数阶粘弹性模型预示推进剂频域下的动态模量变化。推导了三维下的分数阶三参数模型,并结合Grünwald-Letnikov定义编写UMAT子程序。为标定本构参数,推导了带有预加载的蠕变、松弛响应的解析解,并采用遗传算法分别标定了0.4 MPa和0.6 MPa应力下蠕变实验以及10%和30%应变下松弛实验的本构参数。计算得到的有限元数值与解析解、解析解与实验值的时程相对误差均小于5%。采用分数阶三参数模型动态模量对-5、25、60℃下的动态力学实验(DMA)结果进行拟合得到本构参数,动态模量与实验结果误差小于2%,同时随着温度升高,本构参数均减小,体现出HTPB推进剂升温软化现象。结果表明,分数阶三参数模型能精确地描述不同温度下多种频率的HTPB推进剂模量变化,结合二次开发本构,可为后续HTPB推进剂复杂边界下的力学响应的研究提供材料本构模型。

关键词： HTPB推进剂 DMA实验 ABAQUS二次开发分数阶三参数模型遗传算法复模量

激光沉积制造零件表面粗糙度预测及控制方法研究

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航空制造技术 2024年第14期67卷 14-23页

作者：杨光李昕彤王雨时任宇航王向明沈阳航空航天大学沈阳航空航天大学航空制造工艺数字化国防重点学科实验室航空工业沈阳飞机设计研究所

针对激光沉积制造（LDM）成形零件表面粗糙度高、成形质量差，以及打印后必须进行机加工等后处理的问题，自主搭建成形平台，使用“小光斑、小层厚、小粉末粒径”的工艺方法打印具有不同倾斜角度的薄壁零件，并考虑熔道搭接、层间抬升... 详细信息

针对激光沉积制造（LDM）成形零件表面粗糙度高、成形质量差，以及打印后必须进行机加工等后处理的问题，自主搭建成形平台，使用“小光斑、小层厚、小粉末粒径”的工艺方法打印具有不同倾斜角度的薄壁零件，并考虑熔道搭接、层间抬升量及成形角度的影响，基于增材制造分层切片原理，给出了不同几何特征下典型薄壁零件的理论表面粗糙度预测模型，通过实际打印薄壁零件对其进行三维共聚焦观测表面形貌和粗糙度，测量验证了所提出的表面粗糙度预测模型的正确性，并在此基础上提出了激光沉积制造零件表面粗糙度的控制策略。

关键词：激光沉积制造(LDM) Ti–6Al–4V 薄壁件表面粗糙度预测模型

兰州百合鳞茎花青素合成相关MYB与bHLH转录因子的筛选分析

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食品与发酵工业 2024年第2期50卷 57-66页

作者：范文广李保豫田辉李欣任海伟曹莹莹姜欣彤柴佳靖陈少青兰州理工大学生命科学与工程学院甘肃兰州730050

百合鳞茎在采后贮藏过程中,由于花青素的积累导致鳞茎变紫红色,进而影响其价值。该文基于兰州百合鳞茎转录组数据,利用生物信息学技术分析花青素相关转录因子,共分析了50个MYB转录因子与73个bHLH转录因子,包括序列的比对、理化性质分析... 详细信息

百合鳞茎在采后贮藏过程中,由于花青素的积累导致鳞茎变紫红色,进而影响其价值。该文基于兰州百合鳞茎转录组数据,利用生物信息学技术分析花青素相关转录因子,共分析了50个MYB转录因子与73个bHLH转录因子,包括序列的比对、理化性质分析、亚细胞定位、系统进化关系以及保守结构域预测。MYB分类结果显示,50个MYB转录因子中有2个属于1R-MYB类,44个属于R2R3-MYB类,3个属于3R-MYB类,1个属于4R-MYB类。50个MYB不稳定蛋白均为亲水性蛋白,亚细胞定位表明48个MYB定位于细胞核。73个bHLH均为不稳定蛋白,且72个都为亲水性,亚细胞定位显示58个bHLH定位于细胞核。通过与模式植物拟南芥MYB和bHLH转录因子构建进化树分析、保守结构域预测、基因表达量分析以及转录因子与结构基因的相关性分析,初步筛选出3个MYB基因和1个bHLH基因可促进兰州百合鳞茎花青素合成,为进一步深入研究兰州百合鳞茎花青素调控基因提供了理论支持。

关键词：兰州百合(Lilium davidii var.unicolor) 鳞茎 MYB转录因子 bHLH转录因子花青素合成

Carbon materials in electrocatalytic oxidation systems for the treatment of organic pollutants in wastewater:A review

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Carbon Resources Conversion 2023年第4期6卷 262-273页

作者： xintong Duan Dezhang ren Shichun Wang Mengjie Zhang Yaguang Sun Shujing Sun Zhibao Huo Nahui Zhang College of Marine Ecology and Environment Shanghai Ocean University999 Huchenghuan RoadShanghai 201306China The Key Laboratory of Inorganic Molecule-Based Chemistry of Liaoning Province Shenyang University of Chemical TechnologyShenyang 110142China Liaoning Ecological Environmental Monitoring Center Shenyang 110165China

Carbon materials are widely used as catalysts in electrocatalytic oxidative(EO)degradation of wastewater due to their large specific surface area and low *** materials can also be used as catalyst carriers for EO reactions due to their ease of functionalization with other heteroatoms and metals/metal *** improve the catalytic activity and current efficiency of carbon materials,modifying the structural and physicochemical properties of conventional carbon materials are common improvement *** review briefly outlines the recent research progress of carbon materials in EO for organic pollutants *** also discusses the modification strategies and corresponding electrocatalytic properties of various carbon materials(carbon nanomaterials and porous carbon materials),and explores the EO ***,some summaries of the remaining challenges and future developments of carbon materials in the field of electrocatalysis are given.

关键词： Carbon materials Electrocatalytic oxidation Industrial wastewater Mechanism